Abstract: To reduce the construction risk of superlarge diameter slurry shield in muddy coast crossing diaphragm wall to reach reception shaft, a singlelayer fiberglass mesh is set on surface of diaphragm against soil of shield reception shaft of the Su′ai channel, and the design, manufacturing, and hoisting process of the singlelayer fiberglass mesh are optimized. The difference between shield reception through diaphragm with singlelayer fiberglass mesh and launch through diaphragm with common reinforcement mesh is analyzed from the aspects of construction technology risk, schedule, and cost. The results show the following. (1) The adoption of combined reinforcement cage of singlelayer fiberglass mesh and common reinforcement mesh and segmental manufacturing and hoisting effectively ensure the stability of reinforcement cage and its hoisting safety. (2) The adoption of singlelayer fiberglass mesh for diaphragm wall directly crossed by shield ensures the reception safety of superlarge diameter slurry shield. (3) The external reinforcement cage is broken mechanically, which reduces the risk of artificial application and procedure change and shortens the construction schedule by approximately 60%. (4) The singlelayer fiberglass mesh can enhance the ground support effect of the formation, and reduce the consolidation length of reception end soil, thus improve the construction efficiency.

Key words:

superlarge diameter slurry shield, shield reception, singlelayer glass fiber mesh, ultradeep underground diaphragm wall, muddy soft soil